01 -
Preheat the oven to 400°F to prepare for baking.
02 -
Heat a large sauté pan over medium-high heat. Add a small amount of margarine or butter to prevent sticking. Introduce ground beef and diced onions, breaking up the meat while cooking until fully browned.
03 -
Remove the pan from heat and carefully drain off any excess grease to ensure a non-greasy base.
04 -
Add bacon bits, mayonnaise, ketchup, mustard, salt, black pepper, onion powder, and garlic powder to the cooked beef mixture. Stir thoroughly to combine all flavors evenly.
05 -
Transfer the meat mixture to a greased 9 x 13 inch baking dish and spread it evenly.
06 -
Sprinkle 2 cups of shredded mozzarella and cheddar cheese blend uniformly over the meat layer.
07 -
Place frozen tater tots in a single layer atop the cheese to form a crispy crust.
08 -
Bake the assembled dish in the preheated oven for 35 minutes until tater tots are cooked and cheese has melted.
09 -
Remove from oven and evenly distribute the remaining 1 cup shredded cheese and 1/4 cup bacon bits over the top.
10 -
Return to oven and bake an additional 6 to 8 minutes until the cheese melts completely and begins to brown.
11 -
Let the casserole rest for a few minutes to set before serving.